Hi there:I am asking for suggestions for installing Debian 8 in a Dell Precision M380 with Windows 8 installed. I tried every possible option as explained in wiki debian UEFI and other sources of information. Every option was unsuccessful, including "Force grub-efi installation to the removable media path". Secure boot is off and fast startup is disabled in Windows. Only windows can boot.Some suggestion? Thanks.A. Morales

Those images are *not* UEFI capable, if you have installed from such an image then you will need to toggle the CSM or "Legacy" mode to switch between the two systems.

If you are completely sure that a non-live (netinstall) ISO image was used and that the system was booted in UEFI mode during installation (there would have been a "EFI system partition" mount point in the partitioning stage), please post the output of this command from a Windows Administrator prompt: